Sofa



FIG. 1 is a right front perspective view of a sofa showing my new design;

FIG. 2 is a left elevational view thereof, the right side elevation being a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a right front perspective exploded view, shown in the non-reclined position thereof; and,

FIG. 7 is a top plan exploded view, shown in the reclined position thereof.

The elements shown in broken lines illustrate portions of the sofa that form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 